CVE-2026-11703CWE-287

Missing SNI/ALPN binding on stateful (session-ID) TLS session resumption

Medium · published June 25, 2026

CVSS v4.0
6.0
EPSS
0%
Percentile
28.4
In the wild
Unconfirmed
What it is

Missing SNI/ALPN binding on stateful (session-ID) resumption, which previously skipped the binding check performed for ticket-based resumption. A cached session could be resumed under a different SNI/ALPN than originally negotiated and, where client-authentication policy differs across virtual hosts, carry the cached peer-authentication state into a context it was not established for. Resumption now verifies the SNI/ALPN binding for all paths and declines (falling back to a full handshake) on mismatch.

The record
Technical detail
CVSS v4.0
6.0 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
EPSS
0.00359 · 28.4th percentile
Weakness
CWE-287 · Improper Authentication
Published
2026-06-25T21:15Z
EPSS history
Timeline
  • 25 JUN 21:15Z
    Missing SNI/ALPN binding on stateful (session-ID) TLS session resumption
    cvelistv5